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optimize skew line drawing

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This commit is contained in:
Gabor Kiss-Vamosi 2020-02-28 13:09:48 +01:00
parent 760e0eefd6
commit d55f22931f
1 changed files with 22 additions and 3 deletions
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25
src/lv_draw/lv_draw_line.c
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@ -402,7 +402,12 @@ static void draw_line_skew(const lv_point_t * point1, const lv_point_t * point2,
draw_area.x2 -= disp_area->x1;
draw_area.y2 -= disp_area->y1;
int32_t draw_area_w = lv_area_get_width(&draw_area);
/* The real draw area is around the line.
* It's easy to calculate with steep lines, but the area can be very wide with very flat lines.
* So deal with it only with steep lines. */
int32_t draw_area_w;
if(flat) draw_area_w = lv_area_get_width(&draw_area);
else draw_area_w = LV_MATH_MIN(lv_area_get_width(&draw_area), dsc->width * 2 + 2);
/*Draw the background line by line*/
int32_t h;
@ -413,10 +418,24 @@ static void draw_line_skew(const lv_point_t * point1, const lv_point_t * point2,
fill_area.y1 = draw_area.y1 + disp_area->y1;
fill_area.y2 = fill_area.y1;
lv_point_t v;
v.x = p2.x - p1.x;
v.y = p2.y - p1.y;
int32_t x = vdb->area.x1 + draw_area.x1;
/*Fill the first row with 'color'*/
for(h = draw_area.y1; h <= draw_area.y2; h++) {
for(h = draw_area.y1 + disp_area->y1; h <= draw_area.y2 + disp_area->y1; h++) {
memset(mask_buf, LV_OPA_COVER, draw_area_w);
lv_draw_mask_res_t mask_res = lv_draw_mask_apply(mask_buf, vdb->area.x1 + draw_area.x1, vdb->area.y1 + h, draw_area_w);
if(!flat) {
/*Where is the current point?*/
x = (v.y * p1.x - v.x * p1.y + v.x * h) / v.y - dsc->width - 1;
if(x < draw_area.x1 + disp_area->x1) x = draw_area.x1 + disp_area->x1;
fill_area.x1 = x;
fill_area.x2 = fill_area.x1 + draw_area_w - 1;
}
lv_draw_mask_res_t mask_res = lv_draw_mask_apply(mask_buf, x, h, draw_area_w);
lv_blend_fill(clip, &fill_area,
dsc->color, mask_buf, mask_res, opa,